I don't have too much of a problem with the blue background as blue and yellow are complementary colours. I just think that there are too many blurred daffodils in the background that detract from the main subject. This "distraction" is reinforced by the fact that blue and yellow are complementary colours. When I shoot flowers, I try to isolate either a single flower or a group of three flowers, keeping all of them in focus. The "problem" with blurred images is that the viewer will spend time trying to figure out exactly what they are, rather than trying to look at the flower that is in focus. If you really interested in flower photography, take a look at some of the work by Harold Davis and Denise Ippolito. HTH.
WesternGuy